Authentication Failed, Connection error

Game mode: Online unofficial
Type of issue: When trying to connect, error appears
Server type: PvE-Conflict
Region: America, East-coast

When i try to connect to the server im getting an Connection Error that says: Authentication Failed.
I have never had this issue before, i have been playing the game sins launch.
nothing i do seams to work.
what i have done: restarted/updated steam, restarted/updated Conan, Restarted computer, Reinstalling Conan completely (and mods), validating files, reinstalled battleye, (i have done some of these couple of times even)

What is the problem and how to fix it?